Firefox won't access some web sites

I use to be able to access Netflix and Gamespot with firefox 1.5 and then I couldn't. It works on my other PCs I don't seem to be able to figure out why it quit working on this PC. I tried 2.0 with the same results. Has anyone else had this problem. I can access them fine with IE or Opera. Any suggestions would be appreciated.

Yes, for some reason after loading Nod 2.7 I had to set Firefox to higher compatibility to get all the web sites to load. I never had that with 2.5 but that’s ok, just took a little work to figure it out.